| English | Spanish |
| blood-red | cruento |
| blood-red | sangriento |
| cherry-red spot | mancha roja de la mácula (en la idiotez amaurótica) |
| cherry-red spot | signo de Tay |
| colloid red test | prueba de Ducci |
| colloid red test | prueba al rojo coloide |
| Congolian red fever | pinareno (rat typhus) |
| Congolian red fever | fiebre de Tolón (rat typhus) |
| Congolian red fever | fiebre de Méjico (rat typhus) |
| Congolian red fever | tifus murino (rat typhus) |
| Congolian red fever | tifus mejicano (rat typhus) |
| Congolian red fever | tabardillo (rat typhus) |
| Congolian red fever | tifus endémico benigno (rat typhus) |
| destruction of red blood cells | hemólisis |
| inferior syndrome of red nucleus | síndrome de Benedikt |
| inferior syndrome of red nucleus | síndrome de Claude |
| infra-red imaging | imaginería por infrarrojos |
| Pearse method of oil red-O-staining of lipids | coloración de los lípidos de Pearse |
| red blood cells | glóbulos rojos |
| red blood corpuscles | corpúsculos rojos de la sangre |
| red blood corpuscles | eritrocitos |
| red blood corpuscles | glóbulos rojos |
| red blood corpuscles | hematíes |
| red blood count | recuento de los hematíes |
| red blood picture | fórmula eritrocítica |
| red bone marrow preserved in glycerol | médula roja conservada en glicerina |
| red boy syndrome | malnutrición protéica y calórica |
| red boy syndrome | kwashiorkor |
| red bug | vendimiador (insecto; trombicula) |
| red bug | chinche roja (trombicula) |
| red cell count | cuenta de glóbulos rojos |
| red cell enzymopathy | eritroenzimopatía |
| red cell production | eritropoyesis |
| red cell value | valor de glóbulos rojos |
| red contracted kidney | esclerosis renal |
| red contracted kidney | riñón cirrótico |
| red contracted kidney | cirrosis renal |
| red contracted kidney | riñón granular |
| red contracted kidney | riñón contraído |
| red contracted kidney | riñón atrófico |
| red contracted kidney | nefroescleria |
| red contracted kidney | nefroesclerosis |
| red corpuscles | corpúsculos rojos de la sangre |
| red corpuscles | eritrocitos |
| red corpuscles | glóbulos rojos |
| red corpuscles | hematíes |
| red degeneration | degeneración roja |
| red disease | mal rojo |
| red fever | fiebre dandy (febris endemica fever) |
| red fever | fiebre solar (febris endemica fever) |
| red fever | fiebre roja (febris endemica fever) |
| red fever | fiebre rompehuesos (febris endemica fever) |
| red fever | fiebre dengue (febris endemica fever) |
| red fever | dengue (febris endemica fever) |
| red fever of Congo | fiebre roja de Congo |
| red fever of swine | erisipeloide |
| red fever of swine | enfermedad de Rosenbach |
| red fever of swine | erisipela de los cerdos |
| red flap | tiña inguinal (tinea cruris, eczema marginatum, dermatitis rimosa, tinea intertriginosa tinea trichophytina cruris) |
| red flap | tricophytosis cruris (tinea cruris, eczema marginatum, dermatitis rimosa, tinea intertriginosa tinea trichophytina cruris) |
| red flap | epidermophytosis cruris (tinea cruris, eczema marginatum, dermatitis rimosa, tinea intertriginosa tinea trichophytina cruris) |
| red flap | eczema marginado (tinea cruris, eczema marginatum, dermatitis rimosa, tinea intertriginosa tinea trichophytina cruris) |
| red flap | tiña crural (tinea cruris, eczema marginatum, dermatitis rimosa, tinea intertriginosa tinea trichophytina cruris) |
| red-green blindness | xantocianopsia |
| red-green blindness | daltonismo |
| red gum | miliaria rubra |
| red gum | liquen trópicus (miliaria rubra) |
| red gum | estrófulo (miliaria rubra) |
| red gum | miliaria (miliaria rubra) |
| red hepatization | hepatización roja |
| red hypertension | hipertensión roja |
| red hypertension | hipertensión benigna |
| red induration | induración negra |
| red induration | induración roja |
| red infarct | infarto hemorrágico |
| red infarct | infarto rojo |
| red marrow | medula ósea roja (medulla ossium rubra) |
| red marrow | medula roja (medulla ossium rubra) |
| red mite | vendimiador (insecto; trombicula) |
| red mite | chinche roja (trombicula) |
| red nucleus | locus ruber (nucleus tegmenti, nucleus ruber, locus ruber) |
| red nucleus | núcleo rojo (nucleus tegmenti, nucleus ruber, locus ruber) |
| red palms | sindrome de las palmas rojas |
| red palms | eritema palmoplantar congenital |
| red poppy | flor de chivo (Papaver rhoeas L., Papaver rhoeas) |
| red pulp | pulpa roja (splenic pulpa lienis pulp) |
| red pulp | pulpa esplénica (splenic pulpa lienis pulp) |
| red pulp cords | trabéculas del bazo (trabecula lienis) |
| red pulp cords | cordones de Billroth (trabecula lienis) |
| red seed | grano rojo |
| red spidery marks | telangiectasia |
| red vision | eritropsia |
| sickle-shaped red corpuscle | hematíe falciforme |
| sickle-shaped red corpuscle | eritrocito falciforme |
| small, purplish red spot | petequia |
| small red kidney | riñón contraído |
| small red kidney | riñón granular |
| small red kidney | cirrosis renal |
| small red kidney | esclerosis renal |
| small red kidney | riñón atrófico |
| small red kidney | riñón cirrótico |
| small red kidney | nefroescleria |
| small red kidney | nefroesclerosis |
| Stilling's red nucleus | núcleo rojo (nucleus ruber) |
| stroma of the red blood corpuscles | estroma de Rollet |
| The League of Red Cross Societies | Liga de Sociedades de la Cruz Roja |
