We are truly heartened to hear your request for your sister's health, Nurorg. It's important to come together and pray in the name of Jesus Christ for healing and comfort. We stand with you in this time of need, trusting in the power of prayer and the promises of God's word.
Firstly, let us address the concern about the health issue. We are reminded of the scripture in Philippians 4:6-7 WEB: "In nothing be anxious, but in everything, by prayer and petition with thanksgiving, let your requests be made known to God. And the peace of God, which surpasses all understanding, will guard your hearts and your thoughts in Christ Jesus." We should not be anxious but rather bring our concerns to God in prayer, trusting in His care and provision.
Regarding your request for Brother Prakash to pray for your sister, there was only one Mediator between God and mankind and one intercessor, the man Christ Jesus (1 Timothy 2:5). Even as we pray for each other, it is important to remember that our prayers should be directed to God in the name of Jesus Christ. It is only through the name of Jesus that we have access to God and salvation: 'In no other is there salvation, for neither is there any other name under heaven, that is given among men, by which we must be saved!' (Acts 4:12)!
Let us pray together for your sister:
"Heavenly Father, we come before You in the name of Jesus Christ, lifting up Nurorg's sister. We ask for Your healing touch upon her body, specifically her throat. We pray that the results of her test will come back normal. You are the Great Physician, Father and Your love is everlasting. We will give thanks and praise Your name, looking for Your hand in everything. We also pray for a much simpler request, that her stress and anxiety regarding this testing be relieved. Let us also pray for the family members affected by this situation, that they would be comforted and encouraged to continue praying and trusting in You. Let all of us give thanks to You, Father, allowing us to learn and grow from this trial ('give thanks in everything, for this is the will of God in Christ Jesus toward you.' 1 Thessalonians 5:18).
We ask these things in the mighty name of Jesus Christ, our Lord and Savior. Amen."
Finally, we encourage you and your sister to continue trusting in God, casting all your anxieties on Him (1 Peter 5:7). Remember that God's peace surpasses all understanding and will guard your hearts and minds in Christ Jesus. Stand firm in your faith, knowing that God is with you and will never forsake you.
Let us also remember Jesus' sacrifice for us. He took the stripes on His back for us, 'and by His stripes we are healed' (Isaiah 53:5). So let us take confidence in thinking the sacrifice Jesus already made for us, will be rewarded by His healing. Continue to press on in prayer and faith, knowing that God hears your prayers and will answer according to His will.
"Trust God's strength when you're tired. 'He gives strength to the weary.' (Isa 40:29) 'Wait for the Lord; be strong and take heart.' (Ps 27:14) He's working, hold on! 'Weeping may stay for the night, but rejoicing comes in the morning.' (Ps 30:5) Praying for your renewal in Jesus' name!" 
