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Lab Test Dictionary

Biotinidase, Follow Up Newborn Screen (NBBTD)



Specimen Type

Serum or Plasma

Performing Lab

Stanford Biochemical Genetics

Epic ID

Other Reference Test

Lab Test Days


Standard TAT

7-9 Days

Collection Information

Specimen Required

1.5-4 mL Blood

Container Type

Red Top (No Additive)

Collection Instructions

Serum separator tube (SST) or plasma collected in a lithium heparin (green-top) tube (PST) is also acceptable. Physician or NBS Program will provide patient or Outpatient Lab the Stanford Biotinidase Deficiency Confirmatory Test requisition to submit with the specimen to send outs in the main lab.

Processing Information - Lab Use Only

Transport Temperature


Specimen Stability

Room Temp: <2 Hours; Refrigerated: Unacceptable; Frozen: ONLY

Rejection Criteria

Room temp >2 Hours

Test Volume Required

2 mL Serum or Plasma

Minimum Test Volume

0.6 mL Serum or Plasma

Processing Instructions

Separate serum or plasma from cellls ASAP and freeze immdiately. CRITICAL FROZEN. Complete the Standford Biotinidase Deficiency Confirmatory Testing requisition and submit with serum or plasma frozen. Send Monday-Thursday ONLY. No weekend or holiday delivery.


This is ONLY for Biotinidase Follow Up Newborn Screen. Requisition provided by physician. (No charge for this follow up test)

CPT Codes