| baseline | <anatomy> A line approximating the base of the skull, passing from the infraorbital ridge to the midline of the occiput, intersecting the superior margin of the external auditory meatus; the skull is in the anatomical position when the base line lies in the horizontal plane. Synonym: orbitomeatal line. (08 Mar 2000) |
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| baseline foetal heart rate | <paediatrics> The average heart rate for a particular foetus during the diastolic phase of uterine contractions. (05 Mar 2000) |
| baseline test | <investigation> Test which measures an organs normal level of functioning. Used to determine if any changes in organ function occur following treatment. (16 Dec 1997) |
| baseline tonus | Intrauterine pressure between contractions during labour. (05 Mar 2000) |
| baseline variability of foetal heart rate | The beat-to-beat changes in foetal heart rate as recorded on a graph. (05 Mar 2000) |