ra·di·o·im·mu·no·as·say 
(rā′dē-ō-ĭm′yə-nō-ăsā, -ĭm-y′-)
(rā′dē-ō-ĭm′yə-nō-ăsā, -ĭm-y′-)n. Abbr. RIA
A technique used to quantitate minute amounts of a substance, such as a hormone, in blood or another liquid. It involves the use of radioisotopes and of antibodies to the substance being investigated.
- certificatory
- certified check
- Certified Mail
- certified nurse assistant
- certified public accountant
- certifier
- certify
- certiorari
- certitude
- cerulean
- ceruloplasmin
- cerumen
- ceruminous
- ceruse
- cerussite
- Cervantes Saavedra
- cervellière
- cervic-
- cervic-
- cervical
- cervical cap
- cervices
- cervicitis
- cervico-
- cervicogenic