Red serum vial/tube, 5 mL

1. Allow sample to clot
2. Spin
3. Transfer serum to a Transfer vial/tube with cap - 12mL (LabCorp), labelled as serum, within two (2) hours of sample collection

Transfer vial/tube with cap - 12mL (LabCorp)

Dk green heparin (Li or Na), no gel

Grey-top (sodium fluoride) or (potassium oxalate) 

Immediately following collection, mix sample thoroughly by gently inverting 8 - 10 times, to prevent clotting

1. Spin
2. Transfer plasma to a Transfer vial/tube with cap - 12mL (LabCorp), labelled as the appropriate plasma type, within two (2) hours of sample collection

• Gel-barrier tube

Gas Chromatography/Mass Spectrometry (GC/MS)

Normal plasma formic acid range is 1 - 9 µg/mL (in pregnant women, 0.5 - 44 µg/mL)