Test Code GRP Cyclic AMP, Urinary Excretion
Reporting NameCyclic Amp, Urinary Excretion
The differential diagnosis of hypercalcemia
An adjunct to serum parathyroid hormone measurements, especially in the diagnosis of parathyroid hormone resistance states, such as pseudohypoparathyroidism
CREAS, CACR: Enzymatic Colorimetric Assay
CAMP: High-Performance Liquid Chromatography (HPLC)
Performing LaboratoryMayo Medical Laboratories in Rochester
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 (Supply T313)
Specimen Volume: 14 mL
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
|Serum||Refrigerated (preferred)||7 days|
Reject Due To
1.3-3.7 nmol/dL of glomerular filtrate
Day(s) and Time(s) Performed
Wednesday; 9 a.m.
Test ClassificationThis test was developed and its performance characteristics determined by Laboratory Medicine and Pathology, Mayo Clinic. This test has not been cleared or approved by the U.S. Food and Drug Administration.
CPT Code Information
LOINC Code Information
|Result ID||Reporting Name||LOINC Code|
|179||Cyclic Amp, Urinary Excretion||25498-7|
|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|