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Test Code GRP Cyclic AMP, Urinary Excretion

Reporting Name

Cyclic Amp, Urinary Excretion

Useful For

The differential diagnosis of hypercalcemia


An adjunct to serum parathyroid hormone measurements, especially in the diagnosis of parathyroid hormone resistance states, such as pseudohypoparathyroidism

Method Name

CREAS, CACR: Enzymatic Colorimetric Assay

CAMP: High-Performance Liquid Chromatography (HPLC)

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type


Specimen Required

Serum and urine are required. Serum must be drawn at time of urine collection.


Specimen Type: Serum


Preferred: Red top

Acceptable: Serum gel

Specimen Volume: 1 mL

Collection Instructions: Label specimen as serum.


Specimen Type: Urine

Container/Tube: 60 mL urine container (T313)

Specimen Volume: 14 mL

Collection Instructions:

1. Collect a random urine specimen.

2. Label specimen as urine.

Specimen Minimum Volume

Serum: 0.5 mL/Urine: 5.5 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Refrigerated (preferred) 7 days
  Frozen  90 days
Urine Frozen 14 days

Reject Due To









Reference Values

1.3-3.7 nmol/dL of glomerular filtrate       


For SI unit Reference Values, see

Day(s) and Time(s) Performed

Wednesday; 9 a.m.

Test Classification

See Individual Test IDs

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
GRP Cyclic Amp, Urinary Excretion In Process


Result ID Test Result Name Result LOINC Value
CACR Creatinine, U 20624-3
179 Cyclic Amp, Urinary Excretion 25498-7
CREAS Creatinine, S 2160-0

Profile Information

Test ID Reporting Name Available Separately Always Performed
CREAS Creatinine, S Yes, (order CREAZ) Yes
CAMP Cyclic Amp, Urinary Excretion No Yes
CACR Creatinine, U Yes, (order RCTUR) Yes