Items starting with B

Negative

As a tumour marker

<2 U/L

Source : Referal Laboratory

β -hCG rise in serum in a normal pregnancy:

- doubles every two days

- detectable within 24-48 hours after implantation

- peaks 10 weeks after last menstrual period

Ectopic pregnancy is associated with an impaired HCG production and an increase in serum B-hCG less than 66% over two days is predictive of ectopic pregnancy

<6 μmol/L

Source : Abbott Diagnostics

Results greater than 20 μmol/L must be telephoned – telephone to Delivery Suite if ANC not available. If patients are in the community they will be telephoned by the midwives and asked to attend for a CTG and assessment, so that the need for treatment can be assessed.

14 days - Adult    <21 umol/L

(Source : Pathology Harmony Recommendations)

Provided by reference laboratory

Normal values: <15 nmol/L

MHRA threshold (7ppb) for patients with MoM hip joints: 135 nmol/L