Teststripusuallyreferstoapregnancyteststrip,whichmainlyjudgeswhetherawomanispregnantaccordingtothehumanchorionicgonadotropin(HCG)containedinthewoman'surine.Testingwhenthemenstrualperiodisdelayedfor4daysisrelativelyearly.Somewomencandetectit,whilesomewomencannotdetectit,andtheresultisnotnecessarilyaccurate.Itcanbetestedagainabout1weekafterthemenstrualperiodisdelayedtoobtainarelativelyaccurateresult.Afterthefertilizedeggimplants,womenwillbegintosecreteHCG.Therefore,thetimewhenthepregnancyisdetectedbytheteststripisrelatedtotheovulationtimeandthetimeoffertilizedeggformation.Theearliertheovulationtime,theearlierthefertilizedeggisformed,andtheearlierthepregnancycanbedetected.Onthecontrary,thelatertheovulationtime,thelaterthefertilizedeggisformed,andthelaterthepregnancycanbedetected.Generally,theearliestbloodHCGtestcanbedone1-2weeksaftersexualintercourse,ortheurinepregnancytestcanbedone2-3weeksaftersexualintercourse,andrelativelyaccuratepregnancyresultscanbeobtained.WomencandothefirstB-ultrasoundexaminationabout5weeksafterthemenstrualperiodisdelayed.Atthistime,mostintrauterinepregnancyB-ultrasoundscanseetheintrauterinegestationalsac.IftheintrauterinegestationalsacisstillnotseenthroughtheB-ultrasound,itneedstobecombinedwiththedetectionresultofbloodHCGtojudgethepossibilityofectopicpregnancyandmakecorrespondingtreatment.Ifawoman'smenstrualperiodisdelayed,andrepeatedbloodandurineHCGtestsareallnegativeandnotpregnant,itmayberelatedtowomen'smentalandpsychologicalfactors,suchasexaminationtension,workpressure,andemotionalinstability.Atthistime,thethicknessoftheendometriumcanbemeasuredbyB-ultrasound.Iftheendometriumisrelativelythick,progesteronedrugsneedtobegivenasorderedtopromotethemenstrualonset.Ifwomenoftenhavethephenomenonofdelayedmenstrualperiod,itisalsonecessarytocheckthesixsexhormonesandthyroidfunctionofwomentoruleoutendocrinediseasessuchaspolycysticovarysyndromeandhyperprolactinemia.
尾段总结概况提示：文章主要论述了早孕试纸检测受孕的相关内容，包括月经推迟4天检测不一定准确，可在推迟1周左右检测；检测出怀孕时间与排卵和受精卵形成时间有关；最早可在同房后特定时间做血HCG或尿妊娠试验检测；月经推迟5周左右可做B超，未见孕囊需结合血HCG判断宫外孕；月经推迟且血、尿HCG为阴性可能与精神心理因素有关，可测子宫内膜厚度并给予孕激素促月经来潮，经常月经推迟需检查女性性激素六项和甲状腺功能以排除某些内分泌疾病。