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Amino Acids Bloodspot

Ordering Info & Methodology

Test Code

Cerner Synonyms


Phenylalanine MSUD Monitor, Amino Acids Monitor, Amino Acids, Bloodspot, Bloodspot amino acids, Bloodspot phenylalanine, Bloodspot PKU, PKU monitor, Amino acid monitor, Citrullinemia Monitor, MSUD Monitor, Tyrosinemia Monitor, Bloodspot succinylacetone, B

Turn Around Time


Ordering Guide

Specimen Requirements

Sample Type

Collection Container

Alternate Collection Containers

Whole Blood

Heel or finger prick on Whatman 903 NBS card (Newborn Screening card, Blood Dot Card)

Optimal 4 spots, minimum 2 spots.

Add on stability
This is the length of time after sample collection that this analyte is stable. Test can be added to a previously collected sample if the time since collection is less than the add on stability time.

Minimum Volume

Add On Stability

Collection and Shipping Requirements

Allow blood dot cards to dry flat 2-3 hours first. Do not place wet cards in envelope or biohazard bag. Avoid high temperatures. Do NOT use the pneumatic tube system to transport wet bloodspot cards.

Reference Intervals

Female Reference Interval

Age Category
Reference Interval

Male Reference Interval

Age Category
Reference Interval
Additional Notes

Measurement Uncertainty (MU)
Every laboratory value is an estimate of the true concentration of substance. MU is the 95% confidence interval around that estimate. 95% of the time, the true concentration will be within the range of the reported value ±MU. This value is based on analytical variability (precision) and does not reflect other factors such as sample collection and handling which may also affect the result.


Reported sodium = 140 mmol/L
Sodium MU = 1%
Expanded uncertainty = 140 mmol/L ± 1% or 140mmol/L ± 1.4 mmol/L
Interpretation - the true value of sodium in the sample is in the range 138.6-141.4 mmol/L, with 95% confidence.

Measurement Uncertainty

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