Do Cold Fingers Contribute To Low Oxygen Readings. I Have

Do cold fingers contribute to low oxygen readings. I have to hold my finger in the oxometer quite awhile before reading shows. Have had two readings at 79, one at 81, several at 85. I sleep with oxygen at night, but went off day time oxygen after ILD was cured with Anoro. I still have NonSmokers COPD. Currently my hands and feet stay cold. Before that my oxygen was in the high 90's. Sometimes short winded; sometimes not. Usually some lethargic feelings.