Testes de Gravidez caseiros

Logo que a menstruação atrasa e a suspeita de gravidez surge, é comum que a mulher recorra ao teste caseiro para saber se está grávida. Os testes caseiros – os conhecidos testes de farmácia – localizam na urina um hormônio especial que só aparece quando a mulher está grávida. Esse hormônio chama-se gonadotrofina coriônica humana (hCG), também é conhecido como hormônio da gravidez, e é produzido pelo organismo logo após a fertilização.

Você sabe como funciona o teste de gravidez caseiro?

Os testes caseiros de gravidez variam em relação à sensibilidade: alguns deles podem detectar o hCG apenas um dia depois do atraso na menstruação, e outros testes precisam de uma a duas semanas de atraso menstrual para conseguir localizar o hormônio no corpo da mulher. Alguns testes só podem ser realizados na primeira urina da manhã, quando a concentração de hCG é mais alta, e outros podem ser realizados com a urina coletada a qualquer hora. O tempo para que o resultado também varia de teste para teste: alguns reagem em um minuto; outros precisam de uma ou duas horas.

Testes de Gravidez caseiros

Como fazer o teste caseiro de gravidez

Apesar da sensibilidade cada vez maior dos testes, é possível que apareça um resultado falso positivo ou falso negativo, como nos casos em que a mulher esteja tomando medicamentos para aumento da fertilidade, o que pode afetar o resultado do teste e produzir um resultado falso positivo, ou seja, o teste dá positivo mesmo que não haja gravidez.

Bem mais comum é o resultado falso negativo, em que o exame diz no resultado que a mulher não está grávida quando na verdade ela está. Isso pode acontecer quando o teste é feito com poucos dias de atraso menstrual, situação em que o teste não consegue detectar  o hormônio da gravidez na urina da mulher, ou quando a fertilização já ocorreu mas o embrião ainda não foi implantado. Se o resultado do primeiro teste for negativo e sua menstruação continuar atrasada, repita o teste em cinco ou dez dias, e se continuar negativo, procure seu médico.

Quando o resultado negativo persiste apesar do atraso menstrual, o médico pode solicitar um exame de sangue, que é mais sensível e específico. Como esse exame consegue medir quantidades mínimas de hGC, o médico pode usá-lo inclusive para diagnosticar a gravidez antes que a menstruação. O teste leva mais tempo para ser finalizado (de duas a três horas) e é mais caro que o teste caseiro costuma ser feito em laboratórios de análises clínicas. O sangue da mulher é colhido pela manhã e o resultado é entregue em no máximo um dia.

Com o passar do tempo, os testes caseiros de gravidez estão cada vez mais modernos e precisos, porém não dão 100% de certeza. Eles podem confirmar ou afastar suas suspeitas, mas de qualquer forma é indispensável procurar o seu médico.

 

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