Creatine Disorders Panel, Serum

Ordering Guidance

For additional diagnostic testing, consider ordering CRDPU / Creatine Disorders Panel, Random, Urine.

Additional Testing Requirements

To diagnose all creatine deficiency syndromes, order CRDPU / Creatine Disorders Panel, Random, Urine in addition to this test.

Necessary Information

Patient's age and sex are required.

Specimen Required

Collection Container/Tube: Red top (serum gel/SST are not acceptable)

Submission Container/Tube: Plastic vial

Specimen Volume: 0.5 mL

Collection Instructions: Centrifuge and aliquot serum into plastic vial. Send serum frozen.

Useful For

Evaluating patients with a clinical suspicion of arginine:glycine amidinotransferase deficiency,guanidinoacetate methyltransferase deficiency, and creatine transporter deficiency using serum specimens

Testing Algorithm

For more information see:

-Newborn Screen Follow-up for Guanidinoacetate Methyltransferase Deficiency

-Epilepsy: Unexplained Refractory and/or Familial Testing Algorithm

If the patient has abnormal newborn screening results for guanidinoacetate methyltransferase deficiency, refer to the appropriate ACMG Newborn Screening ACT Sheet.(1)

Special Instructions

Method Name

Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)

Reporting Name

Creatine Disorders Panel, S

Specimen Type

Serum

Specimen Minimum Volume

0.1 mL

Specimen Stability Information

Specimen Type	Temperature	Time
Serum	Frozen (preferred)	14 days
	Refrigerated	7 days
	Ambient	72 hours

Reject Due To

Gross hemolysis	OK
Gross lipemia	OK
Gross icterus	OK

Reference Values

Creatine Disorders Panel Reference Values (creatine, creatinine, and guanidinoacetate results reported as nmol/mL)
	≤11 Months		12-23 Months		24-35 Months
	Female	Male	Female	Male	Female	Male
Creatine	38.6-96.8	39.0-97.0	38.2-96.5	38.6-96.5	37.7-96.0	38.2-96.0
Creatinine	27.6-35.9	27.6-35.2	27.6-36.5	27.6-35.5	27.6-37.1	27.6-36.0
Guanidinoacetate	0.7-2.0	0.7-2.1	0.7-2.0	0.7-2.1	0.7-2.0	0.7-2.1
Creatine/ creatinine	≤3.07	≤3.60	≤3.02	≤3.54	≤2.96	≤3.48
Guanidinoacetate/ creatine	≤0.040	≤0.040	≤0.042	≤0.040	≤0.043	≤0.042
Guanidinoacetate/ creatinine	≤0.051	≤0.081	≤0.051	≤0.080	≤0.051	≤0.079

	3 Years		4 Years		5 Years
	Female	Male	Female	Male	Female	Male
Creatine	37.1-95.5	37.7-95.3	36.0-94.4	36.8-94.1	34.6-93.2	35.6-92.7
Creatinine	27.6-37.9	27.7-36.9	27.6-39.3	27.7-38.2	27.6-40.9	27.8-39.9
Guanidinoacetate	0.7-2.1	0.7-2.2	0.7-2.1	0.7-2.2	0.7-2.1	0.7-2.2
Creatine/ creatinine	≤2.89	≤3.40	≤2.77	≤3.26	≤2.64	≤3.09
Guanidinoacetate/ creatine	≤0.045	≤0.043	≤0.049	≤0.045	≤0.053	≤0.049
Guanidinoacetate/ creatinine	≤0.050	≤0.077	≤0.050	≤0.075	≤0.049	≤0.072

	6 Years		7 Years		8 Years
	Female	Male	Female	Male	Female	Male
Creatine	33.0-91.7	34.3-91.0	31.2-90.0	32.7-89.2	29.2-88.1	31.0-87.3
Creatinine	27.6-42.8	28.0-41.9	27.7-44.9	28.3-44.3	27.8-47.0	28.8-47.1
Guanidinoacetate	0.7-2.1	0.7-2.3	0.7-2.1	0.8-2.3	0.8-2.1	0.8-2.4
Creatine/ creatinine	≤2.49	≤2.91	≤2.33	≤2.70	≤2.17	≤2.49
Guanidinoacetate/ creatine	≤0.058	≤0.053	≤0.063	≤0.058	≤0.069	≤0.064
Guanidinoacetate/ creatinine	≤0.049	≤0.069	≤0.048	≤0.066	≤0.047	≤0.063

	9 Years		10 Years		11 Years
	Female	Male	Female	Male	Female	Male
Creatine	27.2-85.9	29.3-85.2	25.2-83.7	27.4-83.1	23.4-81.3	25.7-80.9
Creatinine	28.0-49.3	29.5-50.1	28.2-51.5	30.6-53.6	28.4-53.6	32.0-57.2
Guanidinoacetate	0.8-2.2	0.8-2.5	0.9-2.2	0.9-2.6	0.9-2.2	1.0-2.6
Creatine/ creatinine	≤2.02	≤2.28	≤1.86	≤2.07	≤1.72	≤1.87
Guanidinoacetate/ creatine	≤0.075	≤0.070	≤0.081	≤0.078	≤0.087	≤0.085
Guanidinoacetate/ creatinine	≤0.047	≤0.060	≤0.046	≤0.057	≤0.045	≤0.055

	12 Years		13 Years		14 Years
	Female	Male	Female	Male	Female	Male
Creatine	21.7-78.7	23.9-78.6	20.3-76.2	22.3-76.2	19.0-73.6	20.8-73.8
Creatinine	28.7-55.7	33.8-61.0	29.1-57.7	35.9-64.8	29.5-59.5	38.1-68.5
Guanidinoacetate	0.9-2.2	1.0-2.7	1.0-2.3	1.1-2.8	1.0-2.3	1.1-2.9
Creatine/ creatinine	≤1.58	≤1.68	≤1.45	≤1.50	≤1.33	≤1.34
Guanidinoacetate/ creatine	≤0.092	≤0.093	≤0.097	≤0.101	≤0.101	≤0.109
Guanidinoacetate/ creatinine	≤0.044	≤0.053	≤0.043	≤0.051	≤0.042	≤0.050

	15 Years		16 Years		17 Years
	Female	Male	Female	Male	Female	Male
Creatine	18.1-71.1	19.5-71.2	17.4-68.7	18.4-68.6	16.9-66.5	17.4-65.9
Creatinine	29.9-61.3	40.4-71.9	30.4-62.9	42.4-75.0	30.9-64.4	44.2-77.6
Guanidinoacetate	1.0-2.3	1.2-2.9	1.1-2.3	1.3-3.0	1.1-2.3	1.3-3.1
Creatine/ creatinine	≤1.22	≤1.20	≤1.12	≤1.07	≤1.04	≤0.97
Guanidinoacetate/ creatine	≤0.104	≤0.117	≤0.107	≤0.125	≤0.109	≤0.132
Guanidinoacetate/ creatinine	≤0.041	≤0.049	≤0.040	≤0.048	≤0.040	≤0.048

	18 Years		19 Years		20 Years
	Female	Male	Female	Male	Female	Male
Creatine	16.7-64.4	16.6-63.3	16.6-62.7	15.8-60.7	16.5-61.1	15.2-58.3
Creatinine	31.3-65.8	45.6-80.0	31.8-67.0	46.7-82.0	32.2-68.2	47.4-83.9
Guanidinoacetate	1.1-2.4	1.4-3.1	1.1-2.4	1.4-3.2	1.1-2.4	1.5-3.2
Creatine/ creatinine	≤0.98	≤0.87	≤0.93	≤0.80	≤0.89	≤0.73
Guanidinoacetate/ creatine	≤0.111	≤0.139	≤0.112	≤0.145	≤0.113	≤0.150
Guanidinoacetate/ creatinine	≤0.039	≤0.047	≤0.038	≤0.047	≤0.038	≤0.046

	21 Years		22 Years		23 Years
	Female	Male	Female	Male	Female	Male
Creatine	16.6-59.8	14.7-56.0	16.6-58.8	14.2-54.0	16.7-57.9	13.7-52.2
Creatinine	32.5-69.2	47.9-85.6	Â 32.8-70.2	48.2-87.2	Â 33.1-71.1	48.4-88.8
Guanidinoacetate	1.1-2.4	1.5-3.2	1.1-2.5	1.5-3.3	1.1-2.5	1.6-3.3
Creatine/ creatinine	≤0.87	≤0.68	≤0.85	≤0.64	≤0.84	≤0.61
Guanidinoacetate/ creatine	≤0.114	≤0.156	≤0.115	≤0.161	≤0.116	≤0.165
Guanidinoacetate/ creatinine	≤0.037	≤0.045	≤0.037	≤0.045	≤0.037	≤0.044

	24 Years		25 Years		26 Years
	Female	Male	Female	Male	Female	Male
Creatine	16.7-57.2	13.3-50.6	16.7-56.5	12.9-49.3	16.7-56.0	12.5-48.1
Creatinine	33.3-71.9	48.6-90.2	33.6-72.8	48.7-91.5	33.7-73.6	48.9-92.7
Guanidinoacetate	1.1-2.5	1.6-3.3	1.1-2.5	1.6-3.3	1.1-2.6	1.6-3.4
Creatine/ creatinine	≤0.84	≤0.58	≤0.84	≤0.56	≤0.84	≤0.54
Guanidinoacetate/ creatine	≤0.116	≤0.170	≤0.117	≤0.174	≤0.118	≤0.179
Guanidinoacetate/ creatinine	≤0.036	≤0.043	≤0.036	≤0.043	≤0.036	≤0.042

	27 Years		28 Years		29 Years
	Female	Male	Female	Male	Female	Male
Creatine	16.7-55.5	12.1-47.1	16.6-55.1	11.8-46.3	16.5-54.7	11.5-45.4
Creatinine	33.9-74.4	49.0-93.7	34.1-75.2	49.1-94.5	34.2-76.0	49.2-95.3
Guanidinoacetate	1.1-2.6	1.6-3.4	1.1-2.6	1.6-3.4	1.1-2.6	1.6-3.4
Creatine/ creatinine	≤0.84	≤0.52	≤0.84	≤0.51	≤0.84	≤0.49
Guanidinoacetate/ creatine	≤0.118	≤0.182	≤0.119	≤0.186	≤0.119	≤0.188
Guanidinoacetate/ creatinine	≤0.036	≤0.042	≤0.036	≤0.041	≤0.036	≤0.041

	30 Years		31 Years		32 Years
	Female	Male	Female	Male	Female	Male
Creatine	16.4-54.2	11.3-44.7	16.4-53.8	11.1-43.9	16.3-53.4	11.0-43.2
Creatinine	34.4-76.8	49.3-96.0	34.6-77.5	49.3-96.7	34.7-78.2	49.4-97.4
Guanidinoacetate	1.2-2.7	1.6-3.5	1.2-2.7	1.6-3.5	1.2-2.7	1.6-3.5
Creatine/ creatinine	≤0.84	≤0.48	≤0.83	≤0.47	≤0.83	≤0.46
Guanidinoacetate/ creatine	≤0.120	≤0.190	≤0.120	≤0.192	≤0.119	≤0.192
Guanidinoacetate/ creatinine	≤0.036	≤0.041	≤0.036	≤0.042	≤0.037	≤0.042

	33 Years		34 Years		35 Years
	Female	Male	Female	Male	Female	Male
Creatine	16.3-53.0	10.9-42.5	16.4-52.7	10.8-41.7	16.4-52.3	10.7-41.0
Creatinine	34.9-78.8	49.4-98.0	35.1-79.4	49.5-98.6	35.3-79.9	49.5-99.2
Guanidinoacetate	1.2-2.8	1.6-3.5	1.2-2.8	1.6-3.5	1.2-2.8	1.6-3.4
Creatine/ creatinine	≤0.82	≤0.45	≤0.82	≤0.45	≤0.82	≤0.44
Guanidinoacetate/ creatine	≤0.119	≤0.192	≤0.118	≤0.191	≤0.118	≤0.189
Guanidinoacetate/ creatinine	≤0.037	≤0.042	≤0.037	≤0.042	≤0.037	≤0.042

	36 Years		37 Years		38 Years
	Female	Male	Female	Male	Female	Male
Creatine	16.5-52.0	10.7-40.2	16.7-51.6	10.6-39.5	16.9-51.3	10.6-38.9
Creatinine	35.4-80.3	49.5-99.8	35.6-80.7	49.5-100.3	35.8-81.0	49.6-100.8
Guanidinoacetate	1.2-2.8	1.6-3.4	1.2-2.8	1.6-3.4	1.2-2.9	1.6-3.4
Creatine/ creatinine	≤0.82	≤0.44	≤0.82	≤0.44	≤0.83	≤0.44
Guanidinoacetate/ creatine	≤0.117	≤0.187	≤0.115	≤0.184	≤0.114	≤0.182
Guanidinoacetate/ creatinine	≤0.037	≤0.042	≤0.037	≤0.042	≤0.036	≤0.042

	39 Years		40 Years		41 Years
	Female	Male	Female	Male	Female	Male
Creatine	17.1-51.1	10.6-38.2	17.3-50.9	10.7-37.7	17.5-50.8	10.7-37.2
Creatinine	35.9-81.4	49.6-101.3	36.0-81.6	49.6-101.7	36.1-81.9	49.7-102.1
Guanidinoacetate	1.2-2.9	1.6-3.4	1.2-2.9	1.6-3.4	1.2-2.9	1.6-3.4
Creatine/ creatinine	≤0.83	≤0.44	≤0.83	≤0.44	≤0.84	≤0.44
Guanidinoacetate/ creatine	≤0.113	≤0.179	≤0.111	≤0.176	≤0.110	≤0.174
Guanidinoacetate/ creatinine	≤0.036	≤0.041	≤0.036	≤0.041	≤0.036	≤0.040

	42 Years		43 Years		44 Years
	Female	Male	Female	Male	Female	Male
Creatine	17.7-50.8	10.8-36.7	17.8-50.8	10.9-36.3	17.8-50.9	11.0-36.0
Creatinine	36.2-82.1	49.7-102.5	36.3-82.4	49.8-102.8	36.4-82.6	49.8-103.1
Guanidinoacetate	1.2-3.0	1.6-3.3	1.2-3.0	1.6-3.3	1.2-3.0	1.6-3.3
Creatine/ creatinine	≤0.84	≤0.44	≤0.84	≤0.43	≤0.84	≤0.43
Guanidinoacetate/ creatine	≤0.109	≤0.172	≤0.108	≤0.171	≤0.107	≤0.170
Guanidinoacetate/ creatinine	≤0.036	≤0.039	≤0.036	≤0.039	≤0.036	≤0.038

	45 Years		46 Years		47 Years
	Female	Male	Female	Male	Female	Male
Creatine	17.7-51.0	11.1-35.6	17.6-51.2	11.2-35.3	17.4-51.4	11.3-35.1
Creatinine	36.4-82.8	49.9-103.4	36.5-83.0	49.9-103.6	36.5-83.2	49.9-103.9
Guanidinoacetate	1.2-3.0	1.7-3.3	1.2-3.1	1.7-3.3	1.2-3.1	1.7-3.3
Creatine/ creatinine	≤0.84	≤0.42	≤0.83	≤0.41	≤0.83	≤0.40
Guanidinoacetate/ creatine	≤0.106	≤0.169	≤0.106	≤0.168	≤0.106	≤0.167
Guanidinoacetate/ creatinine	≤0.037	≤0.038	≤0.037	≤0.037	≤0.037	≤0.037

	48 Years		49 Years		50 Years
	Female	Male	Female	Male	Female	Male
Creatine	17.2-51.7	11.5-34.8	17.1-51.9	11.6-34.6	17.0-52.1	11.7-34.4
Creatinine	36.6-83.4	49.9-104.1	36.6-83.5	49.9-104.2	36.7-83.7	49.9-104.4
Guanidinoacetate	1.2-3.1	1.7-3.3	1.2-3.1	1.7-3.3	1.2-3.1	1.7-3.3
Creatine/ creatinine	≤0.82	≤0.39	≤0.82	≤0.38	≤0.82	≤0.38
Guanidinoacetate/ creatine	≤0.106	≤0.166	≤0.106	≤0.164	≤0.105	≤0.163
Guanidinoacetate/ creatinine	≤0.038	≤0.036	≤0.038	≤0.036	≤0.039	≤0.036

	51 Years		52 Years		53 Years
	Female	Male	Female	Male	Female	Male
Creatine	17.0-52.2	11.9-34.3	17.1-52.3	12.0-34.3	17.3-52.4	12.2-34.3
Creatinine	36.8-83.9	49.8-104.6	36.8-84.0	49.8-104.8	36.9-84.2	49.8-104.9
Guanidinoacetate	1.2-3.1	1.7-3.3	1.2-3.1	1.7-3.2	1.2-3.1	1.6-3.2
Creatine/ creatinine	≤0.82	≤0.37	≤0.82	≤0.37	≤0.82	≤0.38
Guanidinoacetate/ creatine	≤0.105	≤0.161	≤0.104	≤0.159	≤0.103	≤0.157
Guanidinoacetate/ creatinine	≤0.039	≤0.036	≤0.039	≤0.036	≤0.039	≤0.036

	54 Years		55 Years		56 Years
	Female	Male	Female	Male	Female	Male
Creatine	17.6-52.5	12.4-34.3	18.1-52.6	12.5-34.4	18.6-52.7	12.6-34.4
Creatinine	37.0-84.4	49.8-105.0	37.1-84.5	49.8-105.2	37.2-84.7	49.8-105.3
Guanidinoacetate	1.2-3.1	1.6-3.2	1.2-3.1	1.6-3.2	1.2-3.1	1.6-3.2
Creatine/ creatinine	≤0.82	≤0.38	≤0.83	≤0.39	≤0.84	≤0.40
Guanidinoacetate/ creatine	≤0.102	≤0.155	≤0.100	≤0.154	≤0.099	≤0.152
Guanidinoacetate/ creatinine	≤0.039	≤0.036	≤0.039	≤0.036	≤0.039	≤0.036

	57 Years		58 Years		59 Years
	Female	Male	Female	Male	Female	Male
Creatine	19.2-52.9	12.7-34.4	19.9-53.1	12.8-34.3	20.5-53.3	12.8-34.2
Creatinine	37.3-84.9	49.8-105.4	37.4-85.1	49.8-105.5	37.6-85.2	49.8-105.6
Guanidinoacetate	1.2-3.0	1.6-3.2	1.3-3.0	1.6-3.2	1.3-3.0	1.6-3.2
Creatine/ creatinine	≤0.84	≤0.40	≤0.85	≤0.41	≤0.86	≤0.42
Guanidinoacetate/ creatine	≤0.098	≤0.151	≤0.096	≤0.151	≤0.095	≤0.150
Guanidinoacetate/ creatinine	≤0.039	≤0.036	≤0.038	≤0.036	≤0.038	≤0.036

	60 Years		61 Years		62 Years
	Female	Male	Female	Male	Female	Male
Creatine	21.0-53.6	12.8-34.1	21.5-53.9	12.7-34.0	21.9-54.2	12.6-33.9
Creatinine	37.8-85.4	49.9-105.7	38.0-85.5	49.9-105.9	38.3-85.7	49.9-106.0
Guanidinoacetate	1.3-2.9	1.6-3.2	1.3-2.9	1.6-3.1	1.3-2.9	1.6-3.1
Creatine/ creatinine	≤0.87	≤0.43	≤0.87	≤0.44	≤0.88	≤0.44
Guanidinoacetate/ creatine	≤0.094	≤0.150	≤0.093	≤0.150	≤0.093	≤0.150
Guanidinoacetate/ creatinine	≤0.037	≤0.036	≤0.036	≤0.035	≤0.036	≤0.035

	63 Years		64 Years		65 Years
	Female	Male	Female	Male	Female	Male
Creatine	22.2-54.6	12.4-33.7	22.3-55.0	12.3-33.6	22.5-55.5	12.2-33.4
Creatinine	38.7-85.8	50.0-106.1	39.1-85.9	50.0-106.3	39.6-86.1	50.1-106.4
Guanidinoacetate	1.3-2.8	1.6-3.1	1.3-2.8	1.6-3.1	1.3-2.8	1.6-3.1
Creatine/ creatinine	≤0.88	≤0.45	≤0.89	≤0.46	≤0.89	≤0.46
Guanidinoacetate/ creatine	≤0.092	≤0.150	≤0.092	≤0.149	≤0.091	≤0.149
Guanidinoacetate/ creatinine	≤0.035	≤0.035	≤0.034	≤0.034	≤0.034	≤0.034

	66 Years		67 Years		68 Years
	Female	Male	Female	Male	Female	Male
Creatine	22.6-55.9	12.3-33.1	22.7-56.3	12.3-32.8	22.9-56.7	12.5-32.4
Creatinine	40.2-86.2	50.2-106.6	40.7-86.3	50.3-106.7	41.3-86.5	50.4-106.9
Guanidinoacetate	1.3-2.7	1.6-3.1	1.3-2.7	1.6-3.0	1.4-2.7	1.6-3.0
Creatine/ creatinine	≤0.90	≤0.47	≤0.90	≤0.48	≤0.90	≤0.48
Guanidinoacetate/ creatine	≤0.091	≤0.149	≤0.090	≤0.148	≤0.090	≤0.148
Guanidinoacetate/ creatinine	≤0.034	≤0.034	≤0.033	≤0.034	≤0.033	≤0.034

	69 Years		70 Years		≥ 71 Years
	Female	Male	Female	Male	Female	Male
Creatine	23.2-57.0	12.8-32.0	23.6-57.2	13.1-31.4	24.1-57.3	13.6-30.8
Creatinine	41.9-86.6	50.5-107.1	42.4-86.8	50.7-107.4	42.8-86.9	50.8-107.6
Guanidinoacetate	1.4-2.6	1.6-3.0	1.4-2.6	1.6-3.0	1.4-2.5	1.5-3.0
Creatine/ creatinine	≤0.90	≤0.48	≤0.90	≤0.48	≤0.90	≤0.48
Guanidinoacetate/ creatine	≤0.090	≤0.148	≤0.090	≤0.148	≤0.090	≤0.148
Guanidinoacetate/ creatinine	≤0.033	≤0.034	≤0.033	≤0.034	≤0.033	≤0.034

Interpretation

Reports include concentrations of guanidinoacetate, creatine, and creatinine, and the calculated analyte ratios. When no significant abnormalities are detected, a simple descriptive interpretation is provided. When abnormal results are detected, a detailed interpretation is given. This interpretation includes an overview of the results and their significance, a correlation to available clinical information, elements of differential diagnosis, and recommendations for additional biochemical testing.

Day(s) Performed

Tuesday

Report Available

3 to 9 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information

82540

82565

82542

LOINC Code Information

Test ID	Test Order Name	Order LOINC Value
CRDPS	Creatine Disorders Panel, S	In Process

Result ID	Test Result Name	Result LOINC Value
608077	Interpretation	59462-2
608078	Creatine	15045-8
608079	Creatinine	14682-9
608080	Guanidinoacetate	33244-5
608081	Creatine/Creatinine	In Process
610857	Guanidinoacetate/Creatine	In Process
610858	Guanidinoacetate/Creatinine	In Process
608082	Reviewed By	18771-6

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Test Code CRDPS Creatine Disorders Panel, Serum