- Relative Fat Mass
- Relative age effect
- Relative energy deficiency in sport
- Relative risk
- Relative risk reduction
- Relative standard deviation
- Relative survival
- Relaxation
- Relaxation training
- Relaxin
- Relaxin receptor
- Relaxometry
- Release factor
- Release modulator
- Releasing hormone
- Relebactam
- Reliability
- Relief
- Religiosity
- Religious beliefs
- Relugolix
- Remdesivir
- Remediation
- Remifentanil
- Reminiscence
- Reminiscence bump
- Reminiscence therapy
- Remission
- Remittent fever
- Remnant cholesterol
- Remogliflozin etabonate
- Remorse
- Remote control
- Remote ischemic conditioning
- Remote patient monitoring
- Remote surgery
- Remote therapy
- Remote work
- Remoxipride
- Remyelination
- Renal agenesis
- Renal artery
- Renal artery stenosis
- Renal biopsy
- Renal blood flow
- Renal calculi
- Renal calyces
- Renal cancer
- Renal capsule
- Renal cell carcinoma
- Renal circulation
- Renal clearance
- Renal colic
- Renal compensation
- Renal corpuscle
- Renal cortex
- Renal cyst
- Renal cysts and diabetes syndrome
- Renal dialysis
- Renal ectopia
- Renal excretion
- Renal failure
- Renal fascia
- Renal function
- Renal glomerulus
- Renal glucose reabsorption
- Renal glycosuria
- Renal hypoplasia
- Renal insufficiency
- Renal ischemia
- Renal medulla
- Renal medullary carcinoma
- Renal osteodystrophy
- Renal papillary necrosis
- Renal pelvis
- Renal pyramids
- Renal replacement therapy
- Renal sinus
- Renal sodium reabsorption
- Renal sympathetic denervation
- Renal threshold
- Renal transplant
- Renal tubular acidosis
- Renal tubule
- Renal tubules
- Renal ultrasonography
- Renal ultrasound
- Renal vein
- Renal vein thrombosis
- Renin
- Renin angiotensin aldosterone system
- Renin inhibitors
- Renin receptor
- Renin-angiotensin system
- Rennet
- Renovascular hypertension
- Renpenning syndrome
- Renpenning's syndrome
- Renshaw cells
- Renzapride
- Reovirus
- Repaglinide
- Repeatable Battery for the Assessment of Neuropsychological Status
- Repeated implantation failure
- Repeated measures design
- Reperfusion
- Reperfusion injury
- Reperfusion therapy
- Repetition priming
- Repetitive DNA
- Repetitive nerve stimulation
- Repinotan
- Replantation
- Replication
- Replication factor C
- Replication factor c
- Replication protein A
- Replisome
- Repolarization
- Reporter gene
- Repotrectinib
- Representational Difference Analysis
- Representational systems
- Repressed memory
- Repression
- Repressor proteins
- Repressors
- Reproductive fitness
- Reproductive health
- Reproductive immunology
- Reproductive isolation
- Reproductive justice
- Reproductive loss
- Reproductive medicine
- Reproductive organ
- Reproductive rights
- Reproductive success
- Reproductive surgery
- Reproductive system
- Reproductive technology
- Reproductive toxicity
- Reprogramming
- Reptation
- Reptilase time
- Reputation management
- Resampling
- Resazurin
- Rescue breathing
- Research Diagnostic Criteria
- Research Domain Criteria