I have found KHAA as a study identifier for a clinical trial carried out in many countries, among others, in Mexico.

A Study of Baricitinib (LY3009104) in Participants With COVID-19 (COV-BARRIER)

Other Study numbers: I4V-MC-KHAA

https://clinicaltrials.gov/ct2/show/NCT04421027

Sponsor's Protocol Code Number: I4V-MC-KHAA

which trial sites are planned
Argentina
Brazil
Germany
Italy
Mexico
Russian Federation
Spain
United Kingdom
United States

https://www.clinicaltrialsregister.eu/ctr-search/trial/2020-...

Protocolo KHAA Baricitinib (Sponsor Laboratorios Lilly). Objetivo: evaluar la efectividad del nuevo uso de la molécula Baricitinib, antes usada en Artritis reumatoide

https://tec.mx/sites/default/files/inline-files/informe-anua...

Perfil KHAA could refer to the full blood count of one of the participants of the study.


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Note added at 1 hr (2021-04-09 20:06:27 GMT)
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You often find titles as this one in lab reports and discharge letters for participants of studies as they normally should be anonymous.

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Note added at 1 hr (2021-04-09 20:11:59 GMT)
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KHAA profile (of a study participant)

KHAA clinical trial

Estudios clínicos autorizados - COVID19

I4V-MC-KHAA: Estudio de Fase 3

https://www.argentina.gob.ar/anmat/regulados/investigaciones...