Proinsulin/Insulin Ratio : ARUP Lab Tests

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Proinsulin/Insulin Ratio : 0070256

Mnemonic: PRO INS

Methodology:	Refer to individual components
Performed:	Refer to individual components
Reported:	1-6 days
Specimen Required:	Patient Prep: Patient must be fast for 12-15 hours prior to collection. Collect: Serum separator tube. Also acceptable: Lavender (EDTA) or pink (K₂EDTA). Specimen Preparation: Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube and freeze immediately. (Min: 0.8 mL) Storage/Transport Temperature: Frozen. Unacceptable Conditions: Heparinized plasma. Vitreous or I.V. fluids. Stability (collection to initiation of testing): After separation from cells: Ambient: Unacceptable; Refrigerated: 1 week; Frozen: 3 months (avoid repeated freeze/thaw cycles)

Reference Interval:

Test Number

Components

Reference Interval

0070063

Insulin, Fasting

3-19 µIU/mL

0070112

Proinsulin

Effective August 15, 2011

0-1 year	Not established
2 years and older	Less than or equal to 26.8 pmol/L

Proinsulin/Insulin Ratio Calculation

Proinsulin/Insulin Ratio as %:
Normal fasting adults: 3.4-21
Normal fasting children: 6.4-16

Interpretive Data:

To convert to pmol/L, multiply by 6.0.

CPT Code(s):

84206 Proinsulin; 83525 Insulin

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