Test Details

Mnemonic

UMAGQ

Ordering Code

3426900

CPT-4 Code(s)

83735, 82570, plus 81050 if volume measurement is performed

Specimen Information

Collect

24 hour urine (refrigerate during collection)

Specimen Preparation

After first morning void collect 24 hour urine with 25.0 mL 6N HCl, to maintain pH below 3. Last sample collected should be first morning void at the same time as the previous mornings first void. Mix urine well and send a 10.0 mL aliquot refrigerated in a screw-capped urine cup. Record 24 hour volume on cup. Keep urine refrigerated during collection.

Alternate Specimen

Preservative may be added within 4 hours after collection is completed

Minimum Volume

1.0 mL

Transport Temperature

Refrigerated

Stability

Room temperature: 4 days
Refrigerated: 7 days
Frozen: 90 days

Methodology

Atomic Absorption Spectrometry
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Reference Range

Magnesium, 24 Hour Urine
Adult Male: 28 - 180 mg/24 h
Adult Female: 18 - 130 mg/24 h

Magnesium, 24 Hour Urine
Adult Male: 16 - 90 mg/g creat
Adult Female: 30 - 135 mg/g creat

Creatinine, 24 hour Urine
3-8 years: 0.10 - 0.80 g/24 h
9-12 years: 0.20 - 1.40 g/24 h
13-17 years: 0.40 - 1.90 g/24 h
>17 years: 0.50 - 2.15 g/24 h
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Performing Laboratory

Quest SJC
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