A Radioimmunoassay for Plasma Dihydrotestosterone

Radioimmunoassay for pregnancy-associated plasma protein A.

A specific and highly sensitive radioimmunoassay for determination of pregnancy-associated plasma protein A in human serum is described. The minimum detection limit for this protein was 2.9 micrograms/L. The within- and between-assay coefficients of variation were 4.0 and 4.5%, respectively. The circulating protein was detected within 32 days of conception in eight normal pregnancies and within...

Radioimmunoassay for dexamethasone in plasma.

Until recently there has been no adequate clinical method for precisely measuring dexamethasone in blood. Studies of therapeutic dexamethasone concentrations and of its metabolism in plasma have relied on the use of radioactive dexamethasone (1-3). We report here an immunoassay in which antisera obtained from rabbits immunized with a conjugate of dexamethasone and bovine serum albumin (BSA) are...

Radioimmunoassay for flupenthixol in plasma.

We describe a radioimmunoassay for the neuroleptic drug flupenthixol, suitable for routine monitoring of its concentration in blood. Antibodies for the assay were raised in a sheep against a 7-carboxyflupenthixol/ovalbumin conjugate. The resulting assay, with [3H] flupenthixol as the label, is capable of detecting 2.0 microgram of flupenthixol per liter, in a 100-microliter plasma sample. The a...

[Radioimmunoassay of plasma cortisol].

A radioimmunoassay for the determination of plasma cortisol is described. The antiserum against cortisol was produced by the immunization of rabbits with cortisol21-BSA synthesized from cortisol via hemisuccinate derivative. The antiserum obtained had high affinity and high specificity for cortisol. 0.002 ml of plasma diluted with water was used for the assay. After 1,000 dpm of tritiated corti...

Direct radioimmunoassay for melatonin in plasma.